Okay the water was at 8.3pH still high but not nearly as horrifying as the first test...He's Much more active now and I've been doing 50% WC a day until his fins grow back
The pH is fine. I wouldn't worry about it as many fish (including Bettas) can adapt quite well to both a pH that is "not optimal" and swings/changes in pH.
The water changes are a good idea.